| 锂离子电池斜方锰酸锂阴极材料的合成与表征 |
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| 引用本文： | 李义兵,陈白珍,李改变,金基明. 锂离子电池斜方锰酸锂阴极材料的合成与表征[J]. 材料研究学报, 2006, 20(1): 83-88 |
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| 作者姓名： | 李义兵 陈白珍 李改变 金基明 |
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| 作者单位： | 中南大学冶金学院冶金物理化学研究所,长沙,410083;贵州新材料矿业有限公司,贵阳,550018 |
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| 摘 要： | 用一步固相法合成了斜方锰酸锂，对其进行了表征并确定了前驱体化合物烧结中的转变过程，以及相互化合间的烧结机制．结果表明，随着煅烧温度的升高，杂相减少，生长出主体相斜方锰酸锂．在700℃以上可以生成均一相的层状斜方类球状和棒状锰酸锂颗粒．两种颗粒的粒度分别为1～5μm和5～15μm．在充放电循环中，斜方锰酸锂结构易于向尖晶石结构转变．在2．5～4．5V范围内以20mA／g电流进行充放电循环，斜方锰酸锂的初始充电容量达到247mAh／g，放电容量为133mAh／g，50次循环后，容量保持率为92％．
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| 关 键 词： | 无机非金属材料 斜方锰酸锂 固相法 电化学行为 |
| 文章编号： | 1005-3093(2006)01-0083-06 |
| 收稿时间： | 2005-04-04 |
| 修稿时间： | 2005-06-28 |
Synthesis and characterization of orthorhombic LiMnO2 cathode material for lithium ion batteries |
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| LI Yibing,CHEN Baizhen,LI Gaibian,JIN Jiming. Synthesis and characterization of orthorhombic LiMnO2 cathode material for lithium ion batteries[J]. Chinese Journal of Materials Research, 2006, 20(1): 83-88 |
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| Authors: | LI Yibing CHEN Baizhen LI Gaibian JIN Jiming |
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| Affiliation: | 1.Institute of Metallurgical Physical Chemistry, Central South University, Changsha 410083 ; 2.Guizhou New Materials and Mining Company Limited, Guiyang 550018 |
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| Abstract: | Orthorhombic LiMnO2 material was synthesized via a one-step solid-state reaction and characterized, and the conversion process of mixture at calcination condition and the mechanism of intercalation reaction were confirmed. It was found that impurities decrease and host phase o-LiMnO2 increases with elevating temperature. Homogeneous o-LiMnO2 sized from 5～15μm with a bar shape and 1～5μm with small spherical shape can be refined above 700℃. The layered orthorhombic LiMnO2 is easy to transform to spinel structure during cycles. The first charge-discharge capacity is 247 mAh·g-1and 133 mAh·g-1 between 2.5 V and 4.5 V at current rate 20 mA·g-1,respectively,and capacity retentionrate can keep at 92 after 50 cycles. |
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| Keywords: | inorganic non-metallic materials orthorhombic LiMnO2 solid-state reaction electro-chemical behavior |
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